<?php
/**
 * Created by PhpStorm.
 * User: tangping
 * Date: 16/4/23
 * Time: 下午9:23
 */

namespace Library;


class Common
{
    public static function getTable($key = '')
    {
        $table = \Server\Server::getTable();
        return $table->get($key);
    }

    public static function  setTable($key = '', $val = '')
    {
        $table = \Server\Server::getTable();
        return $table->set($key, array('data' => $val));
    }

    public  static function delTable($key=''){
        $table = \Server\Server::getTable();
        return $table->del($key);
    }

    /**
     * 检测FORM是否提交
     * @param  $check_token 是否验证token
     * @param  $check_captcha 是否验证验证码
     * @param  $return_type 'alert','num'
     * @return boolean
     */
    public static function chksubmit($check_token = false)
    {
        $submit = isset($_POST['form_submit']) ? $_POST['form_submit'] : $_GET['form_submit'];
        if ($submit != 'ok')
            return false;
        if ($check_token && !Security::checkToken()) {
            return false;
        }
        return true;
    }

    /**
     * 加密函数
     *
     * @param string $txt 需要加密的字符串
     * @param string $key 密钥
     * @return string 返回加密结果
     */
    public static function encrypt($txt, $key = '')
    {
        if (empty($txt))
            return $txt;
        if (empty($key))
            $key = md5(MD5_KEY);
        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
        $ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
        $nh1 = rand(0, 64);
        $nh2 = rand(0, 64);
        $nh3 = rand(0, 64);
        $ch1 = $chars{$nh1};
        $ch2 = $chars{$nh2};
        $ch3 = $chars{$nh3};
        $nhnum = $nh1 + $nh2 + $nh3;
        $knum = 0;
        $i = 0;
        while (isset($key{$i}))
            $knum += ord($key{$i++});
        $mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);
        $txt = base64_encode(time() . '_' . $txt);
        $txt = str_replace(array('+', '/', '='), array('-', '_', '.'), $txt);
        $tmp = '';
        $j = 0;
        $k = 0;
        $tlen = strlen($txt);
        $klen = strlen($mdKey);
        for ($i = 0; $i < $tlen; $i++) {
            $k = $k == $klen ? 0 : $k;
            $j = ($nhnum + strpos($chars, $txt{$i}) + ord($mdKey{$k++})) % 64;
            $tmp .= $chars{$j};
        }
        $tmplen = strlen($tmp);
        $tmp = substr_replace($tmp, $ch3, $nh2 % ++$tmplen, 0);
        $tmp = substr_replace($tmp, $ch2, $nh1 % ++$tmplen, 0);
        $tmp = substr_replace($tmp, $ch1, $knum % ++$tmplen, 0);
        return $tmp;
    }

    /**
     * 解密函数
     *
     * @param string $txt 需要解密的字符串
     * @param string $key 密匙
     * @return string 字符串类型的返回结果
     */
    public static function decrypt($txt, $key = '', $ttl = 0)
    {
        if (empty($txt))
            return $txt;
        if (empty($key))
            $key = md5(MD5_KEY);

        $chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_.";
        $ikey = "-x6g6ZWm2G9g_vr0Bo.pOq3kRIxsZ6rm";
        $knum = 0;
        $i = 0;
        $tlen = @strlen($txt);
        while (isset($key{$i}))
            $knum += ord($key{$i++});
        $ch1 = @$txt{$knum % $tlen};
        $nh1 = strpos($chars, $ch1);
        $txt = @substr_replace($txt, '', $knum % $tlen--, 1);
        $ch2 = @$txt{$nh1 % $tlen};
        $nh2 = @strpos($chars, $ch2);
        $txt = @substr_replace($txt, '', $nh1 % $tlen--, 1);
        $ch3 = @$txt{$nh2 % $tlen};
        $nh3 = @strpos($chars, $ch3);
        $txt = @substr_replace($txt, '', $nh2 % $tlen--, 1);
        $nhnum = $nh1 + $nh2 + $nh3;
        $mdKey = substr(md5(md5(md5($key . $ch1) . $ch2 . $ikey) . $ch3), $nhnum % 8, $knum % 8 + 16);
        $tmp = '';
        $j = 0;
        $k = 0;
        $tlen = @strlen($txt);
        $klen = @strlen($mdKey);
        for ($i = 0; $i < $tlen; $i++) {
            $k = $k == $klen ? 0 : $k;
            $j = strpos($chars, $txt{$i}) - $nhnum - ord($mdKey{$k++});
            while ($j < 0)
                $j += 64;
            $tmp .= $chars{$j};
        }
        $tmp = str_replace(array('-', '_', '.'), array('+', '/', '='), $tmp);
        $tmp = trim(base64_decode($tmp));

        if (preg_match("/\d{10}_/s", substr($tmp, 0, 11))) {
            if ($ttl > 0 && (time() - substr($tmp, 0, 11) > $ttl)) {
                $tmp = null;
            } else {
                $tmp = substr($tmp, 11);
            }
        }
        return $tmp;
    }

    /**
     * 字符串截取，支持中文和其他编码
     *
     * @access public
     * @param string $str
     *            需要转换的字符串
     * @param string $start
     *            开始位置
     * @param string $length
     *            截取长度
     * @param string $charset
     *            编码格式
     * @param string $suffix
     *            截断显示字符
     * @return string
     */
    public static function msubstr($str, $start = 0, $length, $charset = "utf-8", $suffix = true)
    {
        if (function_exists("mb_substr"))
            $slice = mb_substr($str, $start, $length, $charset);
        elseif (function_exists('iconv_substr')) {
            $slice = iconv_substr($str, $start, $length, $charset);
            if (false === $slice) {
                $slice = '';
            }
        } else {
            $re ['utf-8'] = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";
            $re ['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";
            $re ['gbk'] = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";
            $re ['big5'] = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";
            preg_match_all($re [$charset], $str, $match);
            $slice = join("", array_slice($match [0], $start, $length));
        }

        return $suffix && $str != $slice ? $slice . '...' : $slice;
    }

    /**
     * 取得IP
     *
     *
     * @return string 字符串类型的返回结果
     */
    public function getIp()
    {
        if (@$_SERVER['HTTP_CLIENT_IP'] && $_SERVER['HTTP_CLIENT_IP'] != 'unknown') {
            $ip = $_SERVER['HTTP_CLIENT_IP'];
        } elseif (@$_SERVER['HTTP_X_FORWARDED_FOR'] && $_SERVER['HTTP_X_FORWARDED_FOR'] != 'unknown') {
            $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
        } else {
            $ip = $_SERVER['REMOTE_ADDR'];
        }
        return preg_match('/^\d[\d.]+\d$/', $ip) ? $ip : '';
    }
}